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Islip

$157+ Cheap flights from Knoxville to Islip, NY (TYS - ISP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/19. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ISP
Apr 10 — Apr 171
Fri 4/10
Fri 4/17
1 adult, Economy
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Cheap flight deals from Knoxville to Islip

Cheapest flights from Knoxville to Islip
Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.

This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:40 am
TYS
-
ISP
2 stops9h 20m
Southwest
Sat 5/99:20 am
ISP
-
TYS
1 stop4h 00m
Southwest
Deal found 3/6$296
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:05 am
TYS
-
ISP
1 stop3h 45m
Southwest
Tue 5/54:10 pm
ISP
-
TYS
1 stop4h 40m
Southwest
Deal found 3/7$314
This Southwest deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:00 am
TYS
-
ISP
1 stop4h 10m
Southwest
Thu 9/176:10 am
ISP
-
TYS
2 stops11h 00m
Southwest
Deal found 3/10$352
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/117:30 am
TYS
-
ISP
1 stop4h 20m
Southwest
Tue 6/162:55 pm
ISP
-
TYS
1 stop6h 20m
Southwest
Deal found 3/7$357
This Southwest deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:10 am
TYS
-
ISP
1 stop5h 35m
Southwest
Sat 6/205:35 pm
ISP
-
TYS
1 stop3h 45m
Southwest
Deal found 3/10$369
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:10 am
TYS
-
ISP
2 stops14h 25m
Southwest
Sat 7/115:35 pm
ISP
-
TYS
1 stop3h 45m
Southwest
Deal found 3/8$372

Find flight deals from Knoxville to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$296
(Southwest)

One-way from

$157
(Kiwi.com)

Popular in

March

Cheapest in

April

Average price

$470
Provider with most accurate pricing for Knoxville McGhee Tyson-Islip Long Island flight deals.
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Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Islip Long Island flights.
Search Deals
From Knoxville McGhee Tyson to Islip Long Island
Search Deals
One-way flight from Knoxville McGhee Tyson to Islip Long Island
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Islip that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 11, 2026.
Use the filters below to find and compare flights from Knoxville to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Sat 5/2

6:40 am-4:00 pm

2 stops9h 20m

Islip Long Island

Sat 5/9

9:20 am-1:20 pm

1 stop4h 00m

$296

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Wed 7/8

8:10 am-11:50 am

1 stop3h 40m

Islip Long Island

Sat 7/11

2:45 pm-9:20 pm

1 stop6h 35m

$357

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Thu 6/11

7:30 am-11:50 am

1 stop4h 20m

Islip Long Island

Tue 6/16

2:55 pm-9:15 pm

1 stop6h 20m

$357
Quickest round-trip

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Wed 6/17

8:10 am-1:45 pm

1 stop5h 35m

Islip Long Island

Fri 6/19

5:50 pm-10:20 pm

1 stop4h 30m

$369

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Wed 6/17

12:45 pm-10:35 pm

2 stops9h 50m

Islip Long Island

Sat 6/20

5:35 pm-9:20 pm

1 stop3h 45m

$374
Cheapest one-way

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Tue 7/21

8:10 am-1:45 pm

1 stop5h 35m

$169
Quickest one-way

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Sat 4/11

7:45 am-11:35 am

1 stop3h 50m

$219

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Thu 3/19

9:43 pm-11:10 am

2 stops37h 27m

$222

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Thu 4/9

8:05 am-4:30 pm

1 stop8h 25m

$254

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/6

Sorted by cheapest first

Compare providers for flights from Knoxville to Islip

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Islip in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Knoxville-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Knoxville-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Knoxville-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Knoxville-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Knoxville-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Knoxville to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Knoxville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Islip

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Currently, July is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $41). Flying from Knoxville to Islip, New York in December is currently the most expensive (average of $168). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Knoxville to Islip, New York?

    Departing from Knoxville to Islip, New York will take you 9h 20m. The distance between Knoxville and Islip, New York is about 682 mi.

  • Can I find deals for flights from Knoxville to Islip that include hotel bookings?

    Yes. In addition to deals on Knoxville to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Knoxville to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Islip.

  • Can I find deals for business class flights from Knoxville to Islip?

    Yes. Cheapflights offers flight deals from Knoxville to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Knoxville to Islip, New York?

    Currently, July is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $41). Flying from Knoxville to Islip, New York in December is currently the most expensive (average of $168). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Islip?

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